<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
	</body>
	<script type="text/javascript">
		function uuid1() {
			return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
				var r = Math.random() * 16 | 0,
					v = c == 'x' ? r : (r & 0x3 | 0x8);
				return v.toString(16);
			});
		}
		console.log('方法一：', uuid1())

		function uuid2() {
			var s = [];
			var hexDigits = "0123456789abcdef";
			for (var i = 0; i < 36; i++) {
				s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
			}
			s[14] = "4"; // bits 12-15 of the time_hi_and_version field to 0010
			s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01
			s[8] = s[13] = s[18] = s[23] = "-";

			var uuid = s.join("");
			return uuid;
		}
		console.log('方法2：', uuid2())

		function uuid3() {
			function S4() {
				return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
			}
			return (S4() + S4() + "-" + S4() + "-" + S4() + "-" + S4() + "-" + S4() + S4() + S4());
		}
		console.log('方法2：', uuid3())

		// 指定长度和基数
		function uuid4(len, radix) {
			var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
			var uuid = [],
				i;
			radix = radix || chars.length;

			if (len) {
				// Compact form
				for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random() * radix];
			} else {
				// rfc4122, version 4 form
				var r;

				// rfc4122 requires these characters
				uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
				uuid[14] = '4';

				// Fill in random data.  At i==19 set the high bits of clock sequence as
				// per rfc4122, sec. 4.1.5
				for (i = 0; i < 36; i++) {
					if (!uuid[i]) {
						r = 0 | Math.random() * 16;
						uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
					}
				}
			}

			return uuid.join('');
		}
		console.log('方法4：', uuid4(8, 16))
		console.log('方法4：', uuid4(16, 16))


		function uuid5() {
			var withLine = true; //带不带横线
			var len = 36; //长度为36
			var radix = 16; //16进制
			var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
			var uuid = [],
				i;
			radix = radix || chars.length;
			if (withLine) {
				var r;
				uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
				uuid[14] = '4';
				for (i = 0; i < len; i++) {
					if (!uuid[i]) {
						r = 0 | Math.random() * 16;
						uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
					}
				}
			} else {
				for (i = 0; i < len; i++) {
					uuid[i] = chars[0 | Math.random() * radix];
				}
			}
			return uuid.join('');
		}
		console.log('方法5：', uuid4(16, 16))
	</script>
</html>
